Maria Pia Casilio (5 May 1935 – 10 April 2012) was an Italian film actress, best known for major roles in Umberto D. and An American in Rome.
Born in San Pio delle Camere, L'Aquila, Casilio was quite active between 1952 and 1960, usually filling roles as a querulous and naive small-town girl. After her marriage with voice actor Giuseppe Rinaldi, she semi-retired from acting. On the Criterion Collection DVD release of Umberto D., Vittorio De Sica comments she was a lucky charm to have her in his films.